What is the name of the most radioactive isotope on the planet?

Rad 226

Uranus 235

Polonium 210

plutonium 244

210Po is extremely toxic, with one microgram being enough to kill the average adult (250,000 times more toxic than hydrogen cyanide by weight). 210Po was used to kill Russian dissident and ex-FSB officer Alexander V. Litvinenko in 2006.

wikimedia wikipedia → Polonium

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Answers by country

Switzerland

11%

72%

11%

Greece

11%

64%

17%

Australia

11%

60%

22%

the United States

28%

38%

26%

Austria

11%

19%

38%

30%

Ghana

18%

36%

45%

Germany

16%

19%

32%

30%

189

India

32%

30%

27%

150

Nigeria

35%

29%

26%

Poland

13%

37%

27%

20%

1956

Pakistan

45%

27%

the United Kingdom

13%

29%

15%

39%

the Netherlands

33%

58%

Canada

20%

60%

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